Dumping mechanism for trucks



J. A. BEEBE.- DUMPING MECHANISM FOR TRUCKS. APPLICATION 11150 1.111. 24, 1921. RENEWED 05c. 12 1921,

Patented July U, 1922.

[SHEETS-SHEET 1.

1. A. BEEBE. 7

. DUM PING MECHANISM FOR TRUCKS.

APPLICATION FILED JAN. 24,1921- RENEWED DEC.- 121921, QAQQ O'FY, v Patented July 11, 1922.

2 SHEETS-SHEET 2.

has

. STA IE JOHN"A. BEEBE, OF OMAHA, NEBRASKA, ASSIGNOR OF ONE FOURTH TO PERCY A. GREAVES, OF OMAHA, NEBRASKA.

IDU'IVIPING IVIEGHAIIISIVI FOR TRUCKS.

Application filed January 24, 1921, Serial No. 439,458.

To aZZ whom it may concern:

Be it known that I, JOHN A. BEEBE, a

citizen of the United States, residing at Omaha, in the county of Douglas and State of Nebraska, have invented certain new and ing movements of the box, said parts to befew and simple so that manufacture will be economical and operation will be convenient.

The invention consists of the novel construction, combination and arrangement of parts as described herein and claimed, and

as illustrated in the accompanying drawings, 1

wherein,

Fig. 1 is a broken away view showing the rear part of a dumping truck in side elevation, a part of the underframe being removed. Fig. 2 is a transverse section through the box and truck frame on line 2-2 of Fig. 1. Fig. 3 is an end view of the truck. Fig. 4 shows a side view of a hook-moving shaft and its bearings, Fig. 5 is a view showing the position of parts when the box is disposed in dumped position. Figs. 6 and 7 are enlarged details showing the preferred construction of a pivot-plate. Fig. 6 is a side view ofa pivot-plate, a standard and a partof the'underframe of the box being added, Fig; 7 is a plan view of the pivot-platep Fig. 8 shows-a releasing device for the box and its underframe.

Referring 'now to the drawing, the in. vention is illustrated in connection with the,

vided with pivot-pins 14 (Figs. 6. 7.) which project beyond the ends of the yoke, each pin having a cylindrical part 15 and one of Specification of Letters Patent.

Renewed December 12, 1921. Serial No. 521,925. the pins having a terminal part 16 angular in cross-section for a mounting thereon of a standard :0.

I provide a box 17 open at its rear end and provided with an underframe 18, the latter being provided at its lower side with suitaole bearings 19 for the cylindrical parts 15 of the pivot-pins 14, and as thus described the box, together with its underframemay have swinging movements on said pivot-pins, the weight being sustained by the springs 10.

Numeral 20 indicates a door or tail gate for making a closure of the rear end of the box, said gate being pivotally mounted at its top in hinge-members 21 carried by the box. Inorder that the tail gate will be held in closed relation with the box when the latter is disposed in a horizontal position and mav swing outwardly when the box is swung rearwardly I provide means which will operate automatically for these purposes, consisting of a shaft 22 (Fig. 4.) provided with hook-arms 23 and havingjournalled bearings 2a which are provided for the underframe, said shaft being provided at one of its ends with a terminal part which is angular in cross-section.

Numeral 26 indicates an arm which is mounted on the terminal part 25 of the shaft 22, and at 27 is indicated a pull-and push-rod pivotally connected at its respective ends with the standard and arm 26, and it will be understood that since the standard will reniain'stationa-ry while the box has a swinging movement, the center of the arc of said movement being the pivot-pins let, the shaft 22 will be rotated for moving the hookarms, the latter being'swung upwardly for se curing the tail gate in closed relation with the box when the box moves to a horizontal position.

In order that the swinging movements of the box may be under'convenient control, I provide mechanism. consisting, in part, of a rock-lever 28 having a mounting below the box upon a pivot-member 29 (Fig. 2.) carried by a suitable clip-member or frame 30 which'is secured to the vehicle frame 9, forwardly of the pivotal mount of the box, a hoisting-bar 31 being employed which is also disposed below the box and having its upper end mounted to swing from a support 32 carried by the underframe, said bar 31 providing a. pivotal connection 33,

between its ends, for the upper end of the rock-lever 28, the lower end of the bar 31 being pivotally connected, as indicated at 34, with a pull-and-push bar 35 which extends forwardly from the parts mentioned for a pivotal connection 36 with the lower end of a hand-lever 37, said hand-lever beingpivotally mounted between its ends, as indicated at 38,.upon a bracket 39 carried by the vehicle; and by means of a pawl 40 used in connection with a toothed sector 41, an operator, while on the seat 42, may control the swinging movements of the box, by use of the hand-lever.

0n account of the particular arrangement of parts and theirmounting, as mentioned, the box, when heavily loaded, may be -readily and quickly swung rearwardly or forwardly, a very limited force being required for this purpose, and-this feature will be; appreciated by'users of the device.

In order that the swinging movements of the box, by use of the hand lever may be effected with lesser force than would otherwise be required, and that shocks and undue stresses may be avoided, I provide springs to be described, one of these being indicated at 43 having one end secured, as inclicated at (6 to a cross-strip rear-wardly of the pivotal mounting of the box, its front end being secured, as indicated at b to an extension 44 of the rock-lever 28, the action of said spring 43 normally tending to move the extension 44 and lower par-t ofthe rocklever rearwardly, and therefore operating constantly as a force for moving the bar 35 forwardly while the box is disposed in a horizontal position; and therefore a lesser force will be required for swinging the hand-lever 37 rearwardl for movin the box to a: dumped position, this being of -great advantage in instance-s when the greater part of a load is at the front end of the box.

Numeral 45 indicates a spring having one of its ends connected with the front end of the box, as upon a cross-strip 0, its rear end being attached, as indicated at (Z to an arm 46 '(Fig. 2.) of the rocklever, said movement of its front end to thereby prospring not exerting any force while the box is disposed ina horizontal position but operating to resist a movement of the box during the latter part 'of an upward swinging vent shocks or undue vibration, this being of advantage slnce the rear end of-the box often encounters obstructions when swung greater when the front end of the box swings upwardly, and the distance between the mountings o and (Z for the spring 45 being less when the rear end of the box swings downwardly.

In order that the spring 43 may exert a greater or lesser force as an aid in elevating the front end of the box, aperturese are formed in the extension 44 at intervals of its length for-a connection of, the spring43 therewith.

Since the vehicle'- or truck may be driven over obstructions, means are provided for maintaining the box in ahorizontal position, consisting, in part, of a hook-arm 47 which is pivotally mounted upon the frame 9, as indicated at (Fig. 8.), said hoolcarm being adapted toengage a cross-bang which is secured to the underframe 18. Byuse of a foot-lever48, pivotally mounted at 72. upon the frameand which may move against the force of a spring 70, the hook-arm may be released from member 9 to permit dump-- ing, a rock-lever mand suitable rods n being shown for this connection. I

It will be understood that an operator by use of the hand lever may cause a forward movement of the bar 35, the lower end of the hoisting-bar 31 and the upper part of the rook-lever 28 thereby being swung forwardly, the force of the spring 43 aiding in this movement, this operation causing elevation of the front end ofthe box to the position of parts shown in Fig. 5, the spring 45 not being actuated untilthe front end of the box hasnearly' completed its arc of movement. Also it will be understood that when the bar 35' is moved rearwardly by use of the hand lever 37, this movement will be aided by the force of the spring 45, the spring 43 remaining retracted until the front part of the box has completed a part'of its downward movement, at which time the spring 43 will be actuated to prevent an undue shock which otherwise might occur by engagementof. thecross bar 9 with the vehicle frame. I 7

While I have shown the preferred construction in detail, I do not. wishto be understood as limiting myself to exactness in this respect, and changes in form, size,proportion and minor details may be made, these changes. being within the scopeof the invention as claimed.

I claim:

1. In dumping mechanism, the combination with the frame of a vehicle having abox pivot-ally mounted thereon, of a rock-lever pivotally connected with the frame, a hoisting-bar pivotally mounted betweenv its ends upon the rock-lever and-having its upper end pivotally connected with the box, and a longitudinally movable pull-and-pushbar pivotally connected with the lower end of the hoisting-bar.

2. In dumping mechanism, the combina tion with the frame of a vehicle and a box pivotally mounted thereon, of a rock-lever pivotally connected with the vehicle frame, a hoisting-bar pivotally mounted between its ends upon the rook-lever and having its upper end pivotally connected with the box, a pull-and-push bar pivotally connected with the lower end of the hoisting-bar, said pulland-push bar being movable for increasing the distance between the pivotal connection of the rock-lever with the frame and the pivotal connection of the hoisting-bar with the box, and also being movable for decreasing the distance between the pivotal connection of the rock-lever with the frame and the pivotal connection of the hoistingbar with said box.

3. In dumping mechanism, the combination with a vehicle frame and a box pivotally mounted between its ends upon said frame, of a rook-lever pivotally mounted on the frame forwardly of the pivotal mounting of said box, a hoistingbar pivotally mounted on said box forwardly of the pivotal mounting of the box and connected between its ends with the rock-lever, means for increasing the distance between the pivotal mounting of the hoisting-bar and the pivotal mounting of the rock-lever, said means including a movable pull-bar having a mounting upon the hoisting-bar, and a spring connecting the rock-lever with that part of the vehicle box rearwardly of the pivotal mounting of said box.

4. In dumping mechanism, the combination wit-h a vehicle frame and a box pivotally mounted between its ends on said frame, of a rock-lever pivotally mounted on the frame forwardly of the pivotal mounting of the box, a hoisting-bar pivotally mounted on the box forwardly of the pivotal mounting of said box and mounted between its ends on the rook-lever, a pull-bar c011- nected with the hoisting-bar movable for actuating the hoisting-bar and rock-lever, and a spring connected with the rock-lever and said box tending to cause a swinging movement of the rock-lever in one direction, the actuation of the hoisting-bar and rock-lever being for the purpose of elevating the front end of the box.

5. In dumping mechanism, a vehicle frame having a pivotally mounted box thereon, a hoisting-bar connected with the box, a rocklever connected with the vehicle frame, and a movable pull-bar connected with the hoisting-bar to cause a swinging movement of the hoisting-bar and rock-lever for moving the box in a circles are.

6. In dumping mechanism, a vehicle frame having a box pivotally mounted thereon, a longitudinally movable pull-and-push bar, a lever pivotally connected with the frame, a second lever pivotally connected with the first named lever and also pivotally connected with the box, one of said levers being provided with a part extending beyond its pivotal connection with the other lever, said extended part having a pivotal connection with said longitudinally movable pull-and-push bar.

In testimony whereof, I have affixed my signature in presence of two witnesses.

JOHN A. BEEBE.

Witnesses:

HIRAM A. STURGES, ARTHUR H. Srunens. 

